Sound amplifier



FIG. 1 is a perspective view of a sound amplifier showing my new design,

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side thereof;

FIG. 6 is a front view thereof; and,

FIG. 7 is a rear elevational view thereof.

The broken lines shown in the figures depict portions of the sound amplifier and form no part of the claimed design. The dot-dash lines depict a boundary of the claimed design and form no part of the claimed design. 

CLAIM The ornamental design for a sound amplifier, as shown and described. 